Aroma diffuser



FIG. 1 is a perspective view of a aroma diffuser showing my new designwherein the two hidden side walls are identical to the side wall shownin this view;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a side elevation view thereof.

The ornamental design for an aroma diffuser, as shown and described.